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Making of the jib crane & calculations

by speko1
Tags: calculations, mechanics
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speko1
#1
May1-09, 08:18 PM
P: 13
1. The problem statement, all variables and given/known data

Need to do calculations for the jib. The jib is 600 mm long and 40 mm wide. It is attached to a base at the bottom with a pin. The cable is going through from the motor, and at the top there is a pulley. We have to lift 2 kg of weight with a motor.

The jib is very stable, and I am sure it will do its job, but not sure how to calculate all the forces that are acting on the jib. There is a force of 20 N(2kg) which is required to be lifted. Now, I am unsure, whether we have to calculate all the forces in the jib, or just the ones at the top and bottom part.

Also, the jib will be connected to a cable at around 200 mm when going from the top downwards, and once it is at 60 degrees it has to lift required weight of 2 kg.


2. Relevant equations



3. The attempt at a solution

first question:Just need some suggestions whether I should calculate all the forces acting on the jib or just partialy.
second: I am guessing that there is only one moment, and that is at the part where the jib is connected to the base with a pin, point A. As i said above, the jib will also be connected to another cable at 400 mm, measuring from the bottom. Does it mean there will be a moment at point B as well.
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
Attached Thumbnails
jib_paint.jpg  
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